snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

zerver/migrations/0765_set_default_can_create_topic_group.py

@@ -0,0 +1,54 @@
+# Generated by Django 5.2.4 on 2025-07-20 18:24
+
+from django.db import migrations, transaction
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+from django.db.migrations.state import StateApps
+from django.db.models import Max, Min, OuterRef
+
+
+def set_default_value_for_stream_can_create_topic_group(
+    apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
+) -> None:
+    Stream = apps.get_model("zerver", "stream")
+    NamedUserGroup = apps.get_model("zerver", "NamedUserGroup")
+    BATCH_SIZE = 1000
+
+    max_id = Stream.objects.filter(can_create_topic_group=None).aggregate(Max("id"))["id__max"]
+    if max_id is None:
+        # Do nothing if there are no channels on the server.
+        return
+
+    lower_bound = Stream.objects.filter(can_create_topic_group=None).aggregate(Min("id"))["id__min"]
+    while lower_bound <= max_id + BATCH_SIZE / 2:
+        upper_bound = lower_bound + BATCH_SIZE - 1
+        print(f"Processing batch {lower_bound} to {upper_bound} for Stream")
+
+        with transaction.atomic():
+            Stream.objects.filter(
+                id__range=(lower_bound, upper_bound),
+                can_create_topic_group=None,
+            ).update(
+                can_create_topic_group=NamedUserGroup.objects.filter(
+                    name="role:everyone",
+                    realm_for_sharding=OuterRef("realm_id"),
+                    is_system_group=True,
+                ).values("pk")
+            )
+
+        lower_bound += BATCH_SIZE
+
+
+class Migration(migrations.Migration):
+    atomic = False
+
+    dependencies = [
+        ("zerver", "0764_stream_can_create_topic_group"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            set_default_value_for_stream_can_create_topic_group,
+            elidable=True,
+            reverse_code=migrations.RunPython.noop,
+        ),
+    ]